Building DITA-based CMS as integrated documentation environment

General software documents have some problems with traceability and maintenance. This study aims to solve those problems by using DITA, an XML-based architecture for authoring technical documents. In DITA architecture, documents consist of topics and maps. Topics have small amount of information which can reuse, and maps specify contents of each output by organizing topics. It is difficult to break down general documents into reusable topics. In this paper, granularity of topics are defined. As a result of analysis of software documents, it was found that there are three types of structures in software documents, and those need to be broken down into different-sized topics. Besides, a CMS as a software documentation environment is needed for software documentation using DITA. Functions required for the CMS are considered.